CN218210137U - Photoelectric conversion system based on thermal power generating unit - Google Patents
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Abstract
The application discloses a photoelectric conversion system based on a thermal power generating unit, which comprises a photo-thermal conversion system, a thermal power generating unit heat exchange system and a thermoelectric conversion system which are connected through pipelines; the photothermal conversion system comprises a solar heat collector and a heat storage well, and water in the heat storage well is transferred to the solar heat collector for heating and then returns to the heat storage well to complete photothermal conversion; the thermal power unit heat exchange system comprises a drainage heat exchanger, the drainage heat exchanger is positioned in the heat storage well, and high-temperature drainage in the thermal power unit heats water in the heat storage well through the drainage heat exchanger; the thermoelectric conversion system comprises a sixth low-pressure heater and a seventh low-pressure heater, and hot water in the heat storage well is conveyed to the outlet of the sixth low-pressure heater or the outlet of the seventh low-pressure heater according to the temperature difference between the sixth low-pressure heater and the seventh low-pressure heater and thermoelectric conversion is realized.
Description
Technical Field
The application belongs to the technical field of thermal power generation equipment energy conservation, and particularly relates to a photoelectric conversion system based on a thermal power generating unit.
Background
The thermal power generation industry is one of main industries of coal consumption and is a key management and control industry of national energy conservation and emission reduction work. The further promotion of energy conservation and consumption reduction of the thermal power generating unit is an effective means for improving the energy utilization efficiency, and has important significance for realizing carbon emission peak reaching in the power industry and even carbon peak reaching and carbon neutralization targets in China. The state requires that the power industry will continuously optimize energy power structure and layout for the construction uses the new forms of energy as the novel electric power system of main part, and the overall consideration new forms of energy are in the same place the consumption scheduling problem.
In the current energy structure of China, coal still occupies a main position in primary energy consumption, and from the structural proportion analysis of electric power installation and generated energy, coal power is still the current main power supply. In order to better absorb new energy, the thermal power generating unit must deeply participate in peak shaving of a power grid, so that the load factor of the thermal power generating unit is very low, the load factor is limited by the power generation principle of the thermal power generating unit, the power generation coal consumption is inevitably increased when the load factor is lower than a rated value, and the energy utilization efficiency is reduced.
In recent years, with the continuous expansion of the proportion of photovoltaic generators and wind power generators in China, the fluctuation and randomness of the generated energy inevitably put higher requirements on the flexibility peak shaving of a power system. The energy storage technology can improve the consumption proportion of photovoltaic and wind power and guarantee the safety and stability of a power grid, so that the chemical energy storage represented by lithium batteries, the heat storage technology represented by lava, the mechanical energy storage represented by compressed air and flywheel energy storage and other technologies are rapidly developed in recent years, but the energy storage equipment is very expensive in manufacturing cost and long in recovery period of large-scale construction.
At present, new energy projects are required to be equipped with energy storage facilities in a certain proportion, unit cost of the new energy projects is further increased, in order to respond to the national low-carbon target, the use proportion of new energy is improved, coal consumption of a thermal power generating unit is effectively reduced, and a working system capable of reducing the energy consumption level of the existing thermal power generating unit and reducing cost is urgently needed to be found.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, an embodiment of the present application provides a thermal power generating unit-based photoelectric conversion system, and the present application provides a thermal power generating unit-based photoelectric conversion system by coupling a system characteristic of a thermal power generating unit and a solar energy utilization characteristic together, so that the photovoltaic power generating system is invented, the flexibility of the photovoltaic power generating system is improved, the construction cost of the photovoltaic power generating system is greatly reduced, and the energy consumption level of the existing thermal power generating unit can be effectively reduced, and the technical scheme is as follows:
the application provides a photoelectric conversion system based on a thermal power generating unit, which comprises a photo-thermal conversion system, a thermal power generating unit heat exchange system and a thermoelectric conversion system which are connected through pipelines; the photothermal conversion system comprises a solar heat collector and a heat storage well, and water in the heat storage well is conveyed to the solar heat collector for heating and then returns to the heat storage well to complete photothermal conversion; the thermal power unit heat exchange system comprises a drainage heat exchanger, the drainage heat exchanger is positioned in the heat storage well, and high-temperature drainage in the thermal power unit heats water in the heat storage well through the drainage heat exchanger; the thermoelectric conversion system comprises a sixth low-pressure heater and a seventh low-pressure heater, and hot water in the heat storage well is conveyed to the outlet of the sixth low-pressure heater or the outlet of the seventh low-pressure heater according to the temperature difference between the sixth low-pressure heater and the seventh low-pressure heater and thermoelectric conversion is realized.
For example, in the photoelectric conversion system based on the thermal power generating unit provided in an embodiment, the photo-thermal conversion system further includes a heat collection tower water inlet pump, a heat collection tower water inlet pipe, and a heat collection tower water outlet pipe, water in the heat storage well is delivered to the solar heat collector through the heat collection tower water inlet pump and the heat collection tower water inlet pipe, and is heated and then returned to the heat storage well through the heat collection tower water outlet pipe to complete photo-thermal conversion.
For example, in the photoelectric conversion system based on a thermal power generating unit provided in an embodiment, the photothermal conversion system further includes a transmission mechanism connected to the solar thermal collector, and the transmission mechanism is connected to a transmission motor, and the transmission motor is controlled to be turned on and off according to an irradiation angle of sunlight, so as to drive the transmission mechanism to move and adjust an orientation of the solar thermal collector.
For example, in the photoelectric conversion system based on a thermal power generating unit provided in an embodiment, the thermal power generating unit heat exchange system further includes a drain header, a drain pump, and a high-temperature drain pipe, and high-temperature drain water in the thermal power generating unit enters the drain header and is conveyed to the drain heat exchanger located in the heat storage well through the high-temperature drain pipe by the drain pump, so as to heat water in the heat storage well.
For example, in the photoelectric conversion system based on a thermal power generating unit provided by one embodiment, the thermal power generating unit heat exchange system further includes a wastewater recovery system, and the high-temperature drain heats water in the heat storage well to form a low-temperature drain, and the low-temperature drain enters the wastewater recovery system.
For example, in the photoelectric conversion system based on a thermal power generating unit provided in one embodiment, the thermoelectric conversion system further includes a booster water pump and a system water supply pipeline for supplying water to the six low-pressure heater and the seven low-pressure heater, an electric valve B is provided at an outlet of the six low-pressure heater, and an electric valve a is provided at an outlet of the seven low-pressure heater.
For example, in the photoelectric conversion system based on thermal power generating unit that an embodiment provided in the heat storage well still be equipped with the return water gate valve that the heat storage well is linked together, return water gate valve is connected with the condensate pump export, and when hot-water in the heat storage well is carried to No. six low pressure heater export or No. seven low pressure heater export, open return water gate valve, with the synchronous input of condensate pump export in order to maintain the mass balance of working medium in the heat storage well.
For example, in the photoelectric conversion system based on a thermal power generating unit provided in an embodiment, the solar thermal collector is disposed on a heat collecting tower base and a heat collecting tower support, the transmission mechanism is connected to the heat collecting tower support, the transmission motor is connected to a control computer, the transmission motor is controlled by the control computer to be turned on and off according to an irradiation angle of sunlight, and the transmission mechanism is driven to move to adjust an inclination angle of the heat collecting tower support, so as to adjust an orientation of the solar thermal collector.
For example, in the photoelectric conversion system based on the thermal power generating unit provided in one embodiment, a temperature sensor is arranged in the heat storage well to detect the temperature of hot water in the heat storage well.
For example, in the photoelectric conversion system based on a thermal power generating unit provided by one embodiment, a condensed water pipeline is further included, and an eighth low-pressure heater, a seventh low-pressure heater, a sixth low-pressure heater and a fifth low-pressure heater are sequentially arranged on the condensed water pipeline.
The photoelectric conversion system based on the thermal power generating unit has the advantages that: according to the system characteristics of the thermal power generating unit and the characteristics of solar energy utilization, the thermal power generating unit and the solar energy utilization are coupled together, and the photoelectric conversion system based on the thermal power generating unit is invented, so that the flexibility of the photovoltaic power generation system is improved, the construction cost of the photovoltaic power generation system is greatly reduced, and the energy consumption level of the existing thermal power generating unit can be effectively reduced.
This application is in the same place solar energy and thermal power unit coupling, greatly reduced thermal power unit comprehensive energy consumption, promote thermal power unit's energy saving and emission reduction, and for traditional photovoltaic power plant, this system has utilized the original electrical system of thermal power unit, has reduced electrical equipment's investment, system self as long as solve the problem of light and heat conversion and storage can, whole system is simple reliable, can not cause the burden of consuming new forms of energy for electric wire netting system moreover.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a thermal power generating unit-based photoelectric conversion system of the present application;
fig. 2 is a photo-thermal-electric conversion efficiency map of different load sections of a certain thermal power generating unit using the photoelectric conversion system based on the thermal power generating unit of the present application.
Reference numerals: the solar heat collector comprises a solar heat collector 1, a heat collecting tower support 2, a control computer 3, a transmission motor 4, a transmission mechanism 5, a heat collecting tower water inlet pipeline 6, a heat collecting tower water inlet pump 7, a heat collecting tower base 8, a heat collecting tower water outlet pipeline 9, a ground 10, a drainage tank 11, a drainage pump 12, a high-temperature drainage pipeline 13, a drainage heat exchanger 14, a heat storage well 15, a temperature sensor 16, a pressure water pump 17, a system water replenishing pipeline 18, an electric valve A19, an electric valve B20, a water return gate valve 21, a condensed water pipeline 22, a low-pressure heater No. 23-eight, a low-pressure heater No. 24-seven, a low-pressure heater No. 25-six and a low-pressure heater No. 26-five.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
The application provides a photoelectric conversion system based on a thermal power generating unit, which comprises a photo-thermal conversion system, a thermal power generating unit heat exchange system and a thermoelectric conversion system which are connected through pipelines as shown in figure 1; the photothermal conversion system comprises a solar heat collector 1 and a heat storage well 15, and water in the heat storage well 15 is transferred to the solar heat collector 1 to be heated and then returns to the heat storage well 15 to complete photothermal conversion; the heat exchange system of the thermal power generating unit comprises a hydrophobic heat exchanger 14, the hydrophobic heat exchanger 14 is positioned in the heat storage well 15, and high-temperature hydrophobic water in the thermal power generating unit heats water in the heat storage well 15 through the hydrophobic heat exchanger 14; the thermoelectric conversion system comprises a sixth low-pressure heater 25 and a seventh low-pressure heater 24, and the hot water in the heat storage well 15 is conveyed to the outlet of the sixth low-pressure heater 25 or the outlet of the seventh low-pressure heater 24 according to the temperature difference between the sixth low-pressure heater 25, the seventh low-pressure heater 24 and the water in the heat storage well 15, so that thermoelectric conversion is realized.
The solar photothermal conversion efficiency is about 90%, the photoelectric conversion efficiency of the photovoltaic power generation panel based on the crystalline silicon component is far higher, and the manufacturing cost of the solar thermal collector is greatly lower than that of the photovoltaic power generation panel. Meanwhile, the chemical energy storage cost represented by the lithium battery is far higher than that of the hot water heat storage tank, the heat conversion efficiency of the hot water heat storage tank is about 98%, and the electricity conversion efficiency of the lithium battery is only about 95%. The conventional vacuum tube heat collector with the highest photothermal conversion efficiency can only heat water to 80-90 ℃, the hot water energy at the temperature is low in quality and difficult to directly convert into electric energy, but the heat of the part of hot water is combined with a thermodynamic system of a thermal power generating unit, so that the heat can be perfectly converted into mechanical energy of a steam turbine, and a generator is driven to generate electricity. The mode of the application not only saves various electrical equipment configurations of the solar photovoltaic power station, but also saves the construction investment cost of the power transmission line, and aiming at the characteristic of 80-90 ℃ hot water, the hot water can be completely stored by the hot water heat storage tank with low price and input into a thermodynamic system of the thermal power generating unit when needed.
For example, in the photoelectric conversion system based on a thermal power generating unit provided in an embodiment, as shown in fig. 1, the photothermal conversion system further includes a heat collecting tower water inlet pump 7, a heat collecting tower water inlet pipe 6, and a heat collecting tower water outlet pipe 9, and water in the heat storage well 15 is delivered to the solar heat collector 1 through the heat collecting tower water inlet pump 7 and the heat collecting tower water inlet pipe 6, and is heated and then returned to the heat storage well 15 through the heat collecting tower water outlet pipe 9 to complete photothermal conversion. According to the embodiment, the solar heat collector 1 with the tower structure is built by using the idle open space of the power plant, solar energy is converted into heat energy by using the upward space position as much as possible, then the underground space is used for building the heat storage well 15, and hot water in the solar heat collector 1 is stored in the heat storage well 15. Compared with the traditional overground heat storage tank, the arrangement of the underground heat well can reduce the occupied area of a plant area, does not need to consume a large amount of steel, and greatly reduces the construction investment cost.
For example, in the photoelectric conversion system based on a thermal power generating unit provided in an embodiment, as shown in fig. 1, the photothermal conversion system further includes a transmission mechanism 5 connected to the solar thermal collector 1, the transmission mechanism 5 is connected to a transmission motor 4, and the transmission motor 4 is controlled to open and close according to an irradiation angle of sunlight, so as to drive the transmission mechanism 5 to move and adjust an orientation of the solar thermal collector 1.
For example, in the photoelectric conversion system based on a thermal power generating unit provided in an embodiment, as shown in fig. 1, the solar heat collector 1 is disposed on a heat collecting tower base 8 and a heat collecting tower support 2, the heat collecting tower base 8 is disposed on the ground 10, the heat collecting tower support 2 is disposed on the heat collecting tower base 8, the transmission mechanism 5 is connected to the heat collecting tower support 2, the transmission motor 4 is connected to the control computer 3, and the transmission motor 4 is controlled by the control computer 3 to be turned on and off according to an irradiation angle of sunlight and drives the transmission mechanism 5 to move so as to adjust an inclination angle of the heat collecting tower support 2, thereby adjusting an orientation of the solar heat collector 1.
According to the embodiment, the solar heat collector 1 with the tower structure can track the change of the solar illumination direction by arranging the transmission mechanism 5 and the control computer 3, so that the solar heat collector 1 can always face the sun at a better angle, and the heat absorption capacity of the solar heat collector to the solar energy is improved.
For example, in the photoelectric conversion system based on a thermal power generating unit provided in an embodiment, as shown in fig. 1, the thermal power generating unit heat exchange system further includes a drain header 11, a drain pump 12, and a high-temperature drain pipe 13, and high-temperature drain water in the thermal power generating unit enters the drain header 11, and is conveyed to the drain heat exchanger 14 located in the thermal storage well 15 through the high-temperature drain pipe 13 by the drain pump 12, so as to heat water in the thermal storage well 15. According to the embodiment, the drain header 11 and the drain heat exchanger 14 are arranged, so that daily high-temperature drain water of the thermal power generating unit can be intensively utilized, the effect of recycling waste heat is achieved, and the thermal economy of the system is further improved.
For example, in the photoelectric conversion system based on a thermal power generating unit provided in one embodiment, as shown in fig. 1, the heat exchange system of the thermal power generating unit further includes a wastewater recovery system, and low-temperature hydrophobic water formed after water in the heat storage well 15 is heated by high-temperature hydrophobic water enters the wastewater recovery system.
For example, in the photoelectric conversion system based on a thermal power generating unit provided in one embodiment, as shown in fig. 1, the thermoelectric conversion system further includes a booster water pump 17 and a system water supply pipe 18 for supplying water to the sixth low-pressure heater 25 and the seventh low-pressure heater 24, an electric valve B20 is provided at an outlet of the sixth low-pressure heater 25, and an electric valve a19 is provided at an outlet of the seventh low-pressure heater 24. The condensed water pipe 22 is provided with an eighth low pressure heater 23, a seventh low pressure heater 24, a sixth low pressure heater 25 and a fifth low pressure heater 26 in sequence. According to the above embodiment, before the hot water generated by the solar heat collector 1 is input into the condensed water pipeline in the turbine thermodynamic system, the hot water is input into the outlet of the seventh low-pressure heater 24 or the outlet of the sixth low-pressure heater 25 according to the principle of energy matching, so that the thermoelectric conversion efficiency is improved to the maximum extent. If the steam is input to the outlet of the No. six low-pressure heater 25, the extraction steam quantity of six sections, seven sections and eight sections can be reduced, which is equal to the working steam quantity of the low-pressure cylinder of the steam turbine, so that the power generation quantity of the steam turbine is increased, namely the low-quality heat energy is converted into electric energy.
According to the solar heat storage system, solar energy is converted into heat energy which is directly stored in the heat storage well 15, and then the heat energy is input into the thermodynamic system when the load of the thermal power generating unit is low at night, so that the thermoelectric conversion efficiency of the low-grade heat energy is further improved on one hand, and the flexibility of the system operation is further improved on the other hand because the energy storage module is arranged. Compared with a traditional photovoltaic power station, the system utilizes an original electrical system of a thermal power generating unit, reduces investment of electrical equipment, solves the problems of photo-thermal conversion and storage, is simple and reliable, and does not cause new energy consumption burden to a power grid system.
For example, in the photoelectric conversion system based on a thermal power generating unit provided in one embodiment, as shown in fig. 1, a return gate valve 21 communicated with the thermal storage well 15 is further disposed on the thermal storage well 15, the return gate valve 21 is connected with an outlet of a condensate pump, when the hot water in the thermal storage well 15 is conveyed to an outlet of the sixth low-pressure heater 25 or an outlet of the seventh low-pressure heater 24, the return gate valve 21 is opened, and the condensed water at the outlet of the condensate pump is synchronously input into the thermal storage well 15 to maintain mass balance of the working medium.
For example, in the photoelectric conversion system based on a thermal power generating unit provided in one embodiment, as shown in fig. 1, a temperature sensor 16 is disposed in the heat storage well 15 to detect the temperature of hot water in the heat storage well 15. According to the embodiment, water in the heat storage well 15 is heated and then stored in the heat storage well 15 through the photothermal conversion system and the heat exchange system of the thermal power generating unit, and the temperature change of the water in the heat storage well 15 can be monitored in real time through the temperature sensor 16.
The working process of the photoelectric conversion system based on the thermal power generating unit is as follows:
photo-thermal conversion and energy storage process:
the water in the heat storage well 15 is conveyed to the solar thermal collector 1 through the heat collection tower water inlet pump 7 and the heat collection tower water inlet pipeline 6, and is heated and then returns to the heat storage well 15 through the heat collection tower water outlet pipeline 9 to complete photo-thermal conversion; high-temperature drainage in the thermal power generating unit enters the drainage header 11, the high-temperature drainage is conveyed to the drainage heat exchanger 14 in the heat storage well 15 through the high-temperature drainage pipeline 13 by the drainage pump 12 so as to heat water in the heat storage well 15, and low-temperature drainage formed after the high-temperature drainage heats the water in the heat storage well 15 enters the wastewater recovery system;
thermoelectric conversion process:
firstly, the water outlet temperature of the No. seven low-pressure heater 24, the water outlet temperature of the No. six low-pressure heater 25 and the hot water temperature in the heat storage well 15 are obtained, when the water temperature difference between the No. six low-pressure heater 25 and the heat storage well 15 is larger than the water temperature difference between the No. seven low-pressure heater 24 and the heat storage well 15, the electric valve A19 is opened, and the electric valve B20 is closed, so that the hot water in the heat storage well 15 is conveyed to the outlet of the No. seven low-pressure heater 24; when the temperature difference between the sixth low-pressure heater 25 and the heat storage well 15 is smaller than the temperature difference between the seventh low-pressure heater 24 and the heat storage well 15, opening the electric valve B20, and closing the electric valve a19 to convey the hot water in the heat storage well 15 to the outlet of the sixth low-pressure heater 25; when the hot water in the heat storage well 15 is conveyed to the outlet of the sixth low-pressure heater 25 or the outlet of the seventh low-pressure heater 24, the water return gate valve 21 is opened, and the condensed water at the outlet of the condensing pump is synchronously input into the heat storage well 15 to maintain the mass balance of the working medium.
The photothermal-electric conversion efficiency of different load sections is analyzed by analyzing and comparing the data of a certain thermal power generating unit, and the results are shown in table 1 and fig. 2.
TABLE 1 photothermal-to-electric conversion efficiency at different load sections
| Name (R) | Unit of | 100% load | 75% load | 50% load | 40% load |
| Efficiency of photothermal conversion | ％ | 90 | 90 | 90 | 90 |
| Efficiency of thermoelectric conversion | ％ | 8.20 | 8.91 | 9.25 | 9.24 |
| Efficiency of heat storage | ％ | 98.00 | 98.00 | 98.00 | 98.00 |
| Photoelectric efficiency of system | ％ | 7.23 | 7.86 | 8.16 | 8.15 |
As can be seen from table 1 and fig. 2, the photovoltaic conversion system based on the thermal power generating unit converts solar energy into heat energy for storage in the daytime, and the thermal power generating unit transmits the part of heat to the thermodynamic system at a time of deep peak regulation and low load at night, so that higher thermoelectric conversion efficiency can be obtained, and meanwhile, because the thermodynamic system obtains extra heat, the coal consumption for power generation of the thermal power generating unit can be reduced.
Although embodiments of the present application have been disclosed for illustrative purposes, those skilled in the art will recognize that: various modifications, additions and substitutions are possible, without departing from the scope and spirit of the application as disclosed in the accompanying claims.
Claims (10)
1. A photoelectric conversion system based on a thermal power generating unit is characterized by comprising a photo-thermal conversion system, a thermal power generating unit heat exchange system and a thermoelectric conversion system which are connected through pipelines;
the photothermal conversion system comprises a solar heat collector and a heat storage well, and water in the heat storage well is transferred to the solar heat collector for heating and then returns to the heat storage well to complete photothermal conversion;
the thermal power generating unit heat exchange system comprises a drainage heat exchanger, the drainage heat exchanger is positioned in the heat storage well, and high-temperature drainage in the thermal power generating unit heats water in the heat storage well through the drainage heat exchanger;
the thermoelectric conversion system comprises a sixth low-pressure heater and a seventh low-pressure heater, and hot water in the heat storage well is conveyed to the outlet of the sixth low-pressure heater or the outlet of the seventh low-pressure heater according to the temperature difference between the sixth low-pressure heater and the seventh low-pressure heater and thermoelectric conversion is realized.
2. The thermal power generating unit-based photoelectric conversion system according to claim 1, wherein the photo-thermal conversion system further comprises a heat collection tower water inlet pump, a heat collection tower water inlet pipeline and a heat collection tower water outlet pipeline, water in the heat storage well is conveyed to the solar heat collector through the heat collection tower water inlet pump and the heat collection tower water inlet pipeline, and the water is heated and then returns to the heat storage well through the heat collection tower water outlet pipeline to complete photo-thermal conversion.
3. The thermal power generating unit-based photoelectric conversion system according to claim 2, further comprising a transmission mechanism connected to the solar thermal collector, wherein the transmission mechanism is connected to a transmission motor, and the transmission motor is controlled to be turned on and off according to an irradiation angle of sunlight to drive the transmission mechanism to move to adjust the orientation of the solar thermal collector.
4. The thermal power generating unit-based photoelectric conversion system according to claim 1, wherein the thermal power generating unit heat exchange system further comprises a drain header, a drain pump and a high-temperature drain pipe, and high-temperature drain water in the thermal power generating unit enters the drain header and is conveyed to the drain heat exchanger in the heat storage well through the high-temperature drain pipe by the drain pump so as to heat water in the heat storage well.
5. The thermal power unit-based photoelectric conversion system according to claim 4, wherein the thermal power unit heat exchange system further comprises a wastewater recovery system, and low-temperature drainage formed by heating water in the heat storage well by high-temperature drainage enters the wastewater recovery system.
6. The thermal power generating unit-based photoelectric conversion system according to claim 1, further comprising a booster water pump and a system water supply pipeline for supplying water to the sixth low-pressure heater and the seventh low-pressure heater, wherein an electric valve B is arranged at an outlet of the sixth low-pressure heater, and an electric valve A is arranged at an outlet of the seventh low-pressure heater.
7. The thermal power generating unit-based photoelectric conversion system according to claim 6, wherein a water return gate valve communicated with the heat storage well is further arranged on the heat storage well, the water return gate valve is connected with an outlet of a condensate pump, and when hot water in the heat storage well is conveyed to an outlet of the sixth low-pressure heater or an outlet of the seventh low-pressure heater, the water return gate valve is opened, and condensed water at the outlet of the condensate pump is synchronously input into the heat storage well to maintain mass balance of working media.
8. The thermal power generating unit-based photoelectric conversion system according to claim 3, wherein the solar thermal collector is arranged on a thermal collection tower base and a thermal collection tower support, the transmission mechanism is connected with the thermal collection tower support, the transmission motor is connected with a control computer, the transmission motor is controlled to be turned on and turned off by the control computer according to the irradiation angle of sunlight, and the transmission mechanism is driven to move so as to adjust the inclination angle of the thermal collection tower support, and further adjust the orientation of the solar thermal collector.
9. The thermal power generating unit-based photoelectric conversion system according to claim 1, wherein a temperature sensor is provided in the heat storage well to detect a temperature of hot water in the heat storage well.
10. The thermal power generating unit-based photoelectric conversion system according to claim 1, further comprising a condensed water pipeline, wherein an eighth low-pressure heater, a seventh low-pressure heater, a sixth low-pressure heater and a fifth low-pressure heater are sequentially arranged on the condensed water pipeline.
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